[Mailman-Users] email in TO: field

[Alfred]

Hi,

i am a newbie in mailman and have a problem in my configuration:
i setup mailman (2.0.13 under RedHat 8.0) without any problems and it
run ok but when i send a message
to the list every mail goes out as "bulk" email, i like to send out the
messages
with the right emailadress in TO: field

i can not find something in the mailman configuration to disable "bulk"
in TO: field there is now list at HOSTNAME
HOSTNAME = the hostname which is set in /etc/hosts

i like to run 2 lists with different hostnames, i setup every list
correct but in the
TO: field there is ever the HOSTNAME

thanks for your help

Alfred 

ps. sorry for my bad english